People rarely have their carbs in perfect tune either.
You don't need a dyno to dial in EFI, the same way you don't need a dyno to dial in a carb.
Which do you think is quicker to dial in?
A carb, with all it's associated parts, that you have to shut the engine down to change, or EFI, that can be altered in real time, as well as the timing curve.
Most people who carry on about carbs being easier to tune than EFI have never changed a power valve restriction or an air bleed in their lifetime.
People who get EFI and then are are not interested in understanding and tune it should just stick to a 600 vac sec Holley.